Waste Water Acronyms

Waste Water Plant Lab

Wastewater operators and Laboratory personnel can get to talking and using acronyms that people not in the industry might not understand. So, here are a few used among us here at the plant:

  • Mean Cell Residence Time (MCRT): The average time that a microbe is in the treatment process before being removed.
  • Sludge Volume Index (SVI): A measure of the ability of sludge to settle
  • Food to Microorganism Ratio (F/M): A ratio to determine the balance of food and microorganisms in the treatment process.
  • Mixed Liquor Suspended Solids (MLSS): Total amount of organic and inorganic material in suspension.
  • Mixed Liquor Volatile Suspended Solids (MLVSS): Fraction of MLSS that indicates organic solids
  • Total Suspended Solids (TSS): The sum of all insoluble particles suspended in water.
  • Biochemical Oxygen Demand or Biological Oxygen Demand (BOD5): Amount of oxygen used by organisms over a 5 day period.
  • Chemical Oxygen Demand (COD): Amount of oxygen used to oxidize all organic compounds.
  • Waste Activated Sludge (WAS): Sludge that is removed once its life cycle has ended.
  • Dissolved Oxygen (D.O.): Measurement of the amount of oxygen dissolved in water.